Dawn Has Just Turned 13 Years Old,and She Recently Experienced

Dawn has just turned 13 years old,and she recently experienced menarche.If Dawn becomes sexually active,will she be at risk for pregnancy?

A) No. The irregularity of menstrual cycles after menarche means that it will be impossible to have intercourse during an ovulatory cycle.
B) Yes. Menarche represents full sexual maturity and pregnancy is likely.
C) Probably not. She is too young to get pregnant.
D) Possibly. Although irregular menstrual cycles are the norm for some time, pregnancy is still possible.